Each event appears to open up more but we went immediately from the first event to the next (same raid instance) so I could not examine which event opened which items. I've been keeping track of which event drops items so I should be able to fill in which event had the item. If it was in the treasure chest, the event name is given:

Sholano says, in Alaran, 'I'm taking a big chance selling you these items, so I hope you appreciate it. If you're interested, I also have some [special] inventory I might be willing to part with.'

You say, 'What special inventory?'

You have been assigned the task 'Special Inventory'.

Sholano says, in Alaran, 'So you are interested! I have some powerful emblems of our Gods available, but I will only part with one for some Violet Crystallized Essences. Bring them to me and we'll make an exchange.'

The task Special Inventory is an unlimited task. Objective Instructions: Give the Violet Crystallized Essences to Sholano. Status: 0/4. Zone: Erillion, City of Bronze.